Shock is a syndrome in which the main manifestation is a drop in blood pressure, and if it cannot be treated in time, the patient will soon die. The common causes of shock are as follows: 1, hemorrhagic diseases: such as car accidents and crush injuries can cause hemorrhagic shock; 2, heart diseases: such as myocardial infarction can lead to cardiogenic shock; 3, severe infections: can cause septic shock; 4, drug and food allergies: can lead to anaphylactic shock; 5, cranio-cerebral injury: can lead to neurogenic shock.